internal static void copyNodeContent(MemPage pFrom, MemPage pTo, ref RC pRC)
{
if (pRC != RC.OK)
{
return;
}
var pBt = pFrom.Shared;
var aFrom = pFrom.Data;
var aTo = pTo.Data;
var iFromHdr = pFrom.HeaderOffset;
var iToHdr = (pTo.ID == 1 ? 100 : 0);
Debug.Assert(pFrom.HasInit);
Debug.Assert(pFrom.FreeBytes >= iToHdr);
Debug.Assert(ConvertEx.Get2(aFrom, iFromHdr + 5) <= (int)pBt.UsableSize);
// Copy the b-tree node content from page pFrom to page pTo.
var iData = (int)ConvertEx.Get2(aFrom, iFromHdr + 5);
Buffer.BlockCopy(aFrom, iData, aTo, iData, (int)pBt.UsableSize - iData);
Buffer.BlockCopy(aFrom, iFromHdr, aTo, iToHdr, pFrom.CellOffset + 2 * pFrom.Cells);
// Reinitialize page pTo so that the contents of the MemPage structure match the new data. The initialization of pTo can actually fail under
// fairly obscure circumstances, even though it is a copy of initialized page pFrom.
pTo.HasInit = false;
var rc = pTo.btreeInitPage();
if (rc != RC.OK)
{
pRC = rc;
return;
}
// If this is an auto-vacuum database, update the pointer-map entries for any b-tree or overflow pages that pTo now contains the pointers to.
#if !SQLITE_OMIT_AUTOVACUUM
if (pBt.AutoVacuum)
#else
if (false)
#endif
{
pRC = pTo.setChildPtrmaps();
}
}
internal RC getAndInitPage(Pgno pgno, ref MemPage ppPage)
{
Debug.Assert(MutexEx.Held(this.Mutex));
RC rc;
if (pgno > btreePagecount())
{
rc = SysEx.SQLITE_CORRUPT_BKPT();
}
else
{
rc = btreeGetPage(pgno, ref ppPage, 0);
if (rc == RC.OK)
{
rc = ppPage.btreeInitPage();
if (rc != RC.OK)
{
ppPage.releasePage();
}
}
}
Debug.Assert(pgno != 0 || rc == RC.CORRUPT);
return(rc);
}
internal RC getAndInitPage(Pgno pgno, ref MemPage ppPage)
{
Debug.Assert(MutexEx.Held(this.Mutex));
RC rc;
if (pgno > btreePagecount())
rc = SysEx.SQLITE_CORRUPT_BKPT();
else
{
rc = btreeGetPage(pgno, ref ppPage, 0);
if (rc == RC.OK)
{
rc = ppPage.btreeInitPage();
if (rc != RC.OK)
ppPage.releasePage();
}
}
Debug.Assert(pgno != 0 || rc == RC.CORRUPT);
return rc;
}
internal static void copyNodeContent(MemPage pFrom, MemPage pTo, ref RC pRC)
{
if (pRC != RC.OK)
return;
var pBt = pFrom.Shared;
var aFrom = pFrom.Data;
var aTo = pTo.Data;
var iFromHdr = pFrom.HeaderOffset;
var iToHdr = (pTo.ID == 1 ? 100 : 0);
Debug.Assert(pFrom.HasInit);
Debug.Assert(pFrom.FreeBytes >= iToHdr);
Debug.Assert(ConvertEx.Get2(aFrom, iFromHdr + 5) <= (int)pBt.UsableSize);
// Copy the b-tree node content from page pFrom to page pTo.
var iData = (int)ConvertEx.Get2(aFrom, iFromHdr + 5);
Buffer.BlockCopy(aFrom, iData, aTo, iData, (int)pBt.UsableSize - iData);
Buffer.BlockCopy(aFrom, iFromHdr, aTo, iToHdr, pFrom.CellOffset + 2 * pFrom.Cells);
// Reinitialize page pTo so that the contents of the MemPage structure match the new data. The initialization of pTo can actually fail under
// fairly obscure circumstances, even though it is a copy of initialized page pFrom.
pTo.HasInit = false;
var rc = pTo.btreeInitPage();
if (rc != RC.OK)
{
pRC = rc;
return;
}
// If this is an auto-vacuum database, update the pointer-map entries for any b-tree or overflow pages that pTo now contains the pointers to.
#if !SQLITE_OMIT_AUTOVACUUM
if (pBt.AutoVacuum)
#else
if (false)
#endif
{
pRC = pTo.setChildPtrmaps();
}
}